diff --git a/js/form_data.ts b/js/form_data.ts
index 6626435201..6f0cadfef1 100644
--- a/js/form_data.ts
+++ b/js/form_data.ts
@@ -100,8 +100,8 @@ class FormDataBase {
 }
 
 // tslint:disable-next-line:variable-name
-export const FormData = DomIterableMixin<
+export class FormData extends DomIterableMixin<
   string,
   domTypes.FormDataEntryValue,
   typeof FormDataBase
->(FormDataBase, dataSymbol);
+>(FormDataBase, dataSymbol) {}
diff --git a/js/form_data_test.ts b/js/form_data_test.ts
index fef61542e7..f3fbdd8724 100644
--- a/js/form_data_test.ts
+++ b/js/form_data_test.ts
@@ -1,6 +1,10 @@
 // Copyright 2018 the Deno authors. All rights reserved. MIT license.
 import { test, assert, assertEqual } from "./test_util.ts";
 
+test(function formDataHasCorrectNameProp() {
+  assertEqual(FormData.name, "FormData");
+});
+
 test(function formDataParamsAppendSuccess() {
   const formData = new FormData();
   formData.append("a", "true");